Abstract
In order to enhance the achievable sum rate of indoor non-orthogonal multiple access (NOMA) aided multiple-input multiple-output (MIMO) visible light communication (VLC) downlink networks, in this paper, an efficient low computational complexity power allocation strategy termed as normalized logarithmic gain ratio power allocation (NLGRPA) is proposed, in which the optical channel information of all transmitter light-emitting diodes (LEDs) are exploited and properly ordered to ensure efficient power allocation Numerical results depict that our proposed NLGRPA method exhibits significant improvement in terms of achievable sum rate of NOMA aided MIMO-VLC networks when compared with other conventional power allocation approaches. Specifically, the proposed NLGRPA algorithm attains an achievable sum rate improvement of more than 55% and 33% compared with the gain ratio power allocation (GRPA) method and normalized gain difference power allocation (NGDPA) method in the 4 × 2 MIMO-VLC networks with nine randomly distributed users.
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